Direct power converter
A power conversion device, direct technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, irreversible DC power input conversion to AC power output, etc., to reduce rated time, reduce power capacity, The effect of lowering the withstand voltage
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no. 1 Embodiment approach
[0059] figure 1 A conceptual configuration diagram of a motor drive device as an example of the direct power conversion device according to the first embodiment of the present invention is shown. The motor drive device has: power supply E1; input lines ACLr, ACLs, ACLt; reactors Lr, Ls, Lt; capacitors Cr, Cs, Ct; current-type converter 1; DC power lines L1, L2; clamping circuit 2; a braking circuit 3; a voltage type inverter 4; and a motor 5.
[0060] The power supply E1 is a multi-phase AC power supply, for example, a 3-phase AC power supply, and supplies 3-phase AC currents to the input lines ACLr, ACLs, and ACLt.
[0061] Reactors Lr, Ls, Lt are provided on input lines ACLr, ACLs, ACLt, respectively.
[0062] Capacitors Cr, Cs, and Ct are connected between input lines ACLr, ACLs, and ACLt, respectively. More specifically, one end thereof is connected to reactors Lr, Ls, and Lt located on the opposite side of the power supply E1, respectively, and the other ends thereof ...
no. 2 Embodiment approach
[0098] A conceptual configuration diagram of a motor drive device according to a second embodiment of the present invention and figure 1 same. In this motor drive device, since the transistor S1 is continuously turned on while the voltage Vc1 across the clamp capacitor C2 exceeds the reference voltage Vref-h, the longer this period is, the longer the rated time required for the transistor S1 is. Therefore, in the motor drive device according to the second embodiment, the rated time required for the transistor S1 is reduced by reducing the period during which the current continues to flow through the transistor S1.
[0099] The resistance value r1 of the discharge resistor R1 is less than or equal to a value obtained by dividing the reference voltage Vref-h by the maximum value Imax of the current flowing through the discharge resistor R1. That is, r1≦Vref-h / Imax (hereinafter referred to as formula (9)) is satisfied.
[0100] Figure 6 For example, when the current supply t...
no. 3 Embodiment approach
[0113] The conceptual configuration diagram of the motor drive device according to the third embodiment is the same as that of figure 1 same. Figure 8 It is a conceptual configuration diagram of the clamp circuit 2 included in the motor drive device of the third embodiment.
[0114] clamp circuit 2 with figure 1 Compared with the clamp circuit 2 shown, it further includes a clamp capacitor C3 and diodes D6 to D8. The clamp capacitor C3 is connected between the diode D1 and the clamp capacitor C2. The diode D6 is located between the clamping capacitors C2 and C3, its positive pole is connected to the clamping capacitor C3, and its negative pole is connected to the clamping capacitor C2 and the diode D2. The anode of the diode D7 is connected between the diode D1 and the clamp capacitor C3, and the cathode is connected to the DC power supply line L1. The anode of the diode D8 is connected to the DC power supply line L2, and the cathode is connected between the diode D6 an...
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